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US3745959A - Continuous flow hydrofoil configuration - Google Patents

Continuous flow hydrofoil configuration Download PDF

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Publication number
US3745959A
US3745959A US00204642A US3745959DA US3745959A US 3745959 A US3745959 A US 3745959A US 00204642 A US00204642 A US 00204642A US 3745959D A US3745959D A US 3745959DA US 3745959 A US3745959 A US 3745959A
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US
United States
Prior art keywords
hydrofoil
foil
boat
assembly
inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00204642A
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English (en)
Inventor
C Coffey
R Gornstein
W Shultz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Boeing Co
Original Assignee
Boeing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Boeing Co filed Critical Boeing Co
Application granted granted Critical
Publication of US3745959A publication Critical patent/US3745959A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/16—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces
    • B63B1/24—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type
    • B63B1/28—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type with movable hydrofoils
    • B63B1/30—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving additional lift from hydrodynamic forces of hydrofoil type with movable hydrofoils retracting or folding

Definitions

  • the arrangement employs a hydrofoil strut assembly which is pivotally mounted to the boat for pivoting the assembly to a foil-submerged or foil-emerged position.
  • the foil strut assembly utilizes a center strut or column which has a first inlet and internal duct for feeding water to the propulsion means during foil-submerged conditions.
  • a second hull inlet in the duct is provided which opens upon foil-strut retraction, thus replacing the first inlet so that continuous water input at the foilborne and hull-borne operations is maintained.
  • the foil strut overall assembly adds to structural strength, and the outer struts act as efficient end plates to the lifting foil surfaces thereby reducing the tip vortex formation and increasing the system efficiency.
  • This invention relates to hydrofoil craft and more particularly to a hydrofoil strut assembly that is pivotally arranged for submerged and emerged conditions with means for providing continuous water input for its water jet propulsion system.
  • the invention relates to a fluid intake means for providing sea water to a water jet propulsion system for propelling a hydrofoil craft at foilbome or hullborne conditions.
  • the fluid intake means comprsies a nonstructural aft strut or column pivotally mounted on the hull of a hydrofoil craft.
  • the strut includes a simple conduit means which comminicates between a scoop or inlet at the free end of the strut and a fluid pump mounted on the hull of the craft whereby seat water is.
  • an alternate inlet is formed at the hinging area of the nonstructural strut when in retracted position.
  • Gongwer appears to show a simple non-structural conduit means including a scoop or inlet fixed to and extending from the bottom surface of a surface water craft whereby the arrangement of the conduit means provides for the efiicient operation of a liquid jet'propulsion system 12 for propelling the surface water craft.
  • the conduit means are fixed to the ull of the-craft rather than adapted to a pivotally mounted non-structural strut.
  • the two patents to Davis and the patent to Singelmann are of general interest for their showings of various forms of water jet propulsion systems for hydrofoil crafts in which an aft structural strut rather than a nonstructural strut includes a conduit means communicating between a suction inlet in a strut and the suction inlet of a pump for providing increased efficiency of a propulsion system.
  • Davis 5 14 shows the suction inlets 20 in the struts communicating with the suction inlets of pumps 24 mounted within a hydrofoil craft hull.
  • the Davis 163 and Singelmann patents show a pump mounted within the strut and communicating between suction and discharge passages within the strut for increasing the efficiencyof the jet propulsion system.
  • hydrofoil strut assembly that employs a water inlet on a non-structural center positioned strut or column pivotally mounted to a hull and simulataneously and automatically provides for an alternate inlet means during retraction or fold-up of the strut assembly is new and novel in the art.
  • SUMMARY OF THE INVENTION drodynamic effect of the struts at the ends of the foils is similar to that of end plates, cutting down tip vortices and diminishing the induced drag, thereby increasing system efficiency.
  • the interconnected arrangements of the struts with the foils also provide for a structurally lighter yet stronger and more stable arrangement, and, in addition, provides for a configuration with less hullstrut interference as compared with prior art single foil strut devices.
  • the overall effect that is hereby produced will increase the load versus power effectiveness by an appreciable factor.
  • the hydrofoil boat being hullborne is now maneu' vering itself with its water jet propulsion at a reduced draft through the harbor facilities and as soon as deeper water is entered the reverse action will take place by first pivoting the foil-strut assembly into the extended or foil-borne position, and thereafter the water jet propulsion power is increased so that the hydrofoil boat becomes foilbome and continuouswater or liquid is upplied to the water jet propulsion by the centercolumn water intake means.
  • the supplied liquid or water is ducted to a pair of centrifugal type of water pumps which are further connected to its individual nozzle so that a right and a left nozzle for water jet propulsion will provide forward thrust to move the hydrofoil boat.
  • a hydrofoil support arrangement for a hydrofoil boat utilizing water jet propulsion for foilbome and hullborne operations which comprises a hydrofoil strut assembly pivotally mounted to said boat for pivoting the assembly to a downward foilsubmerged position and for pivoting the assembly to an emerged-foil position.
  • the strut assembly is provided with an inlet and duct means for receiving water for said propulsion means at said submerged position, and the arrangement will provide for a second inlet for the propulsion means upon retraction of the strut assembly so that a continuous water input at the submerged and emerged foil positions is provided for.
  • FIG. 1 is a side view of a hydrofoil boat showing hydrofoil support arrangement in its submerged or extended position.
  • FIG. 2 is a perspective forward view of the hydrofoil aft strut assembly including its liquid intake means and propulsion system.
  • FIG. 3 is a perspective aft view of the stern portion of the hydrofoil boat which in particular illustrates the exterior propulsion means as well as the specifically designed stern body configuration adapted for receiving the retracted hydrofoil aft assembly.
  • FIG. 4 is a perspective view of the stern of the hydrofoil boat when hullborne and when the hydrofoil assembly is folded in a retracted position.
  • FIG. 1 the preferred embodiment of a hydrofoil boat with a forward hydrofoil assembly 12 and an aft hydrofoil assembly 14 in an extended position.
  • the hydrofoil boat 10 When hullborne, the hydrofoil boat 10 is provided with means to pivot the hydrofoil assembles 12 and 14 in a retracted position. This type of a position is shown in FIG. 1 in phantom-line fashion and shows the foil-strut assemblies above the hullborne water line.
  • the propulsion means for the hydrofoil boat 10 comprises a pair of controlled liquid output nozzles located at the underneath stern hull area.
  • FIG. 2 shows the aft strut assembly from a front or forward location and in addition the integral water propulsion system.
  • the hydrofoil assembly 14 comprises a right-hand strut 18, a center column 30 and a left-hand strut which are pivotally mounted outside of the hull side of the hydrofoil boat 10 by pivot points 22 and 24, respectively.
  • the center column 30 includes an intake duct 32 with vanes 34 to guide the liquid in a predetermined and controlled fashion towards the propulsion and pumping means 36.
  • Each pumping means 40 and 42 compresses the water to a higher pressure and, accordingly, feeds the water to the output or nozzles 44 and 46 located at starand portboard, respectively.
  • the output as well as the direction of each individual nozzle can be regulated by the deck ofiicer on duty; however, the means to control the output as well as the steering or direction of the nozzles is not illustrated since such means are well known in the propulsion art.
  • FIG. 3 part of the poopdeck, as well as the hull-stern portion of the hydrofoil boat is provided with a cut-out configuration 50 which serves to receive the center column 30 when placed in the retracted position so that a minimum of drag is obtained when the hydrofoil boat is hullborne.
  • this configuration and unique design remove the complete aft hydrofoil assembly 14 above the water line.
  • the pivoting of the aft hydrofoil assembly 14 is all about one axis which is above the hullborne water line 52.
  • the intake means 34 is now inaccessible for liquid input to the propulsion means and therefore a second inlet means has to be provided for so that the same propulsion power is being maintained.
  • the present configuration provides at the center strut or column 30 pivotal mounting with the hull 56 a hull-strut junction 58 having a second inlet 60 which becomes available as soon as the hydrofoil assembly 14 is folded in the retracted aftwards position as shown in FIG. 4.
  • This inlet 60 continues to provide liquid to the pumps 40 and 42 in the same manner as when the water was flowing through the duct 34 so that a continuous water flow to the propulsion means is provided for without any interruption.
  • the overall unique arrangement of the hull-stem portion area provides for l) the fold-away of the aft hydrofoil strut assembly, 2) continuous water intake, 3) submerged positioning of the water propulsion nozzles, during in-harbor maneuvering, in a most efiicient manner when the hydrofoil boat 10 is hullborne. Furthermore, the arrangement provides for a non-structural center strut or column with water intake means which provides for 1) one hull-strut interference only, 2) stronger structural assembly for horizontal foils, 3) thin, non-resistant side struts reducing drag to minimum, acting as end plates and cutting down tip vortices.
  • the overall effect of the advantages of this novel comination projects a loadpower effectiveness that is twice that of prior art competitive arrangements.
  • the hull being provided with water passage means leading to said propulsion means;
  • said foil-strut assembly being provided with a water-receiving inlet and duct means connecting the inlet with said passage means to supply water to the passage and propulsion means while said assembly is in said submerged position;
  • said passage menas having a water-receiving inlet for supplying water to said propulsion means when the foil-strut assembly is pivoted to said emerged position so that continuous water input for said propulsion means at said submerged and emerged foil positions is provided for.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
US00204642A 1971-12-03 1971-12-03 Continuous flow hydrofoil configuration Expired - Lifetime US3745959A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20464271A 1971-12-03 1971-12-03

Publications (1)

Publication Number Publication Date
US3745959A true US3745959A (en) 1973-07-17

Family

ID=22758803

Family Applications (1)

Application Number Title Priority Date Filing Date
US00204642A Expired - Lifetime US3745959A (en) 1971-12-03 1971-12-03 Continuous flow hydrofoil configuration

Country Status (8)

Country Link
US (1) US3745959A (sv)
JP (1) JPS517909B2 (sv)
BE (1) BE810486Q (sv)
DK (1) DK151472C (sv)
ES (1) ES409158A1 (sv)
GB (1) GB1368909A (sv)
IT (1) IT973838B (sv)
SE (1) SE389645B (sv)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910215A (en) * 1973-06-21 1975-10-07 Boeing Co Safety system for hydrofoil craft
US4041885A (en) * 1975-12-31 1977-08-16 Garcia Emilio C Apparatus for and method of stabilizing a marine vessel in pitch
US4989533A (en) * 1988-07-04 1991-02-05 Yamaha Hatsudoki Kabushiki Kaisha Support strut for hydrofoil craft
US20100297895A1 (en) * 2009-05-19 2010-11-25 Advanced Marine Concepts, Llc Marine propulsion system
GB2580022A (en) * 2018-11-30 2020-07-15 Norwegian Univ Sci & Tech Ntnu Propulsion for hydrofoil vessels
IT202100022175A1 (it) * 2021-08-23 2023-02-23 Northern Light S R L Foil basculante estraibile dallo scafo di un’imbarcazione

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE405835B (sv) * 1974-03-04 1979-01-08 Hydro Tech Corp Pump for framdrivning av en bat
JPH0590730U (ja) * 1991-07-29 1993-12-10 日本電気ホームエレクトロニクス株式会社 照明器具の取付け構造
SG176622A1 (en) * 2009-06-03 2012-01-30 Austal Ships Pty Ltd Trimaran motion damping

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3265027A (en) * 1965-03-12 1966-08-09 Gen Electric Propulsor
US3348514A (en) * 1966-02-09 1967-10-24 Worthington Corp Centrifugal pump to provide jet propulsion

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3265027A (en) * 1965-03-12 1966-08-09 Gen Electric Propulsor
US3348514A (en) * 1966-02-09 1967-10-24 Worthington Corp Centrifugal pump to provide jet propulsion

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910215A (en) * 1973-06-21 1975-10-07 Boeing Co Safety system for hydrofoil craft
US4041885A (en) * 1975-12-31 1977-08-16 Garcia Emilio C Apparatus for and method of stabilizing a marine vessel in pitch
US4989533A (en) * 1988-07-04 1991-02-05 Yamaha Hatsudoki Kabushiki Kaisha Support strut for hydrofoil craft
US20100297895A1 (en) * 2009-05-19 2010-11-25 Advanced Marine Concepts, Llc Marine propulsion system
US8142242B2 (en) 2009-05-19 2012-03-27 Advanced Marine Concepts, Llc Marine propulsion system
GB2580022A (en) * 2018-11-30 2020-07-15 Norwegian Univ Sci & Tech Ntnu Propulsion for hydrofoil vessels
IT202100022175A1 (it) * 2021-08-23 2023-02-23 Northern Light S R L Foil basculante estraibile dallo scafo di un’imbarcazione

Also Published As

Publication number Publication date
IT973838B (it) 1974-06-10
DK151472B (da) 1987-12-07
BE810486Q (fr) 1974-05-29
DK151472C (da) 1988-05-30
SE389645B (sv) 1976-11-15
JPS517909B2 (sv) 1976-03-11
JPS4864690A (sv) 1973-09-06
GB1368909A (en) 1974-10-02
ES409158A1 (es) 1976-03-01

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